/Engine/Plugins/Runtime/MassEntity/Source/MassEntity/Public/MassObserverManager.h
bool HasObserversForBitSet ( const [FMassFragmentBitSet](API\Plugins\MassEntity\FMassFragmentBitSet) & InQueriedBitSet, const [EMassObservedOperation](API\Plugins\MassEntity\EMassObservedOperation) Operation ) const